Yes, there are many free resources available online for learning how to train your dog. Here are some of the most popular resources:

1. YouTube: YouTube is an excellent resource for learning how to train your dog. There are many channels dedicated to dog training, including Zak George’s Dog Training Revolution, Kikopup, and Simpawtico Dog Training. These channels offer a variety of free training videos covering everything from basic obedience commands to more advanced behaviors.
2. Online forums: Online forums such as Reddit and Dogforums.com are great resources for getting advice and tips on training your dog. You can ask questions and get advice from other dog owners and trainers, and read through threads to learn from others’ experiences.
3. Online courses: There are many online courses available for learning how to train your dog. While some of these courses charge a fee, there are also free courses available, such as the AKC GoodDog! Helpline Online Training Course. This course covers basic obedience commands and is free for AKC registered dogs.
4. Blogs: There are many dog training blogs available online that offer free tips and advice on training your dog. Some popular blogs include The Whole Dog Journal, Canine Journal, and The Spruce Pets.
5. Local shelters and rescues: Many local shelters and rescues offer free training classes or workshops for dog owners. These classes are usually taught by experienced trainers and cover basic obedience commands and behavior issues.
6. Social media groups: Social media groups, such as Facebook groups, are another great resource for learning how to train your dog. There are many groups dedicated to dog training, and you can ask questions and get advice from other group members.

In conclusion, there are many free resources available online for learning how to train your dog. YouTube, online forums, online courses, blogs, local shelters and rescues, and social media groups are all great resources for getting advice and tips on training your dog. With these resources, you can learn how to train your dog without spending any money on a professional trainer.